Configuration options for TriStar geometry (Dreistern / 3-Pointed Star / Concave Hexagon).
Optional
Arm edge length (a). Defaults to 1.5.
Extrusion depth along Y (t). Defaults to 0 (planar 2D in X-Z plane).
Inner apex angle at the tip in radians (alpha). Defaults to PI / 6 (30 degrees). Must be < PI.
Configuration options for TriStar geometry (Dreistern / 3-Pointed Star / Concave Hexagon).